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DeKalb County, Illinois

DeKalb County, Illinois
Sycamore Dek cty gov leg center.jpg
DeKalb County's Legislative Center
Seal of DeKalb County, Illinois
Seal
Map of Illinois highlighting DeKalb County
Location in the U.S. state of Illinois
Map of the United States highlighting Illinois
Illinois's location in the U.S.
Founded March 4, 1837
Named for Johann de Kalb
Seat Sycamore
Largest city DeKalb
Area
 • Total 635 sq mi (1,645 km2)
 • Land 631 sq mi (1,634 km2)
 • Water 3.4 sq mi (9 km2), 0.5%
Population
 • (2010) 105,160
 • Density 167/sq mi (64/km²)
Congressional districts 14th, 16th
Time zone Central: UTC-6/-5
Website www.dekalbcounty.org
Sycamore, Illinois
Climate chart ()
J F M A M J J A S O N D
 
 
1.5
 
 
27
10
 
 
1.4
 
 
32
16
 
 
2.5
 
 
44
26
 
 
3.5
 
 
58
37
 
 
4.2
 
 
70
48
 
 
4.5
 
 
80
58
 
 
4.2
 
 
84
63
 
 
4.5
 
 
81
61
 
 
3.5
 
 
74
51
 
 
2.6
 
 
62
40
 
 
2.8
 
 
45
28
 
 
2.1
 
 
32
17
Average max. and min. temperatures in °F
Precipitation totals in inches
Source: The Weather Channel
J F M A M J J A S O N D
 
 
1.5
 
 
27
10
 
 
1.4
 
 
32
16
 
 
2.5
 
 
44
26
 
 
3.5
 
 
58
37
 
 
4.2
 
 
70
48
 
 
4.5
 
 
80
58
 
 
4.2
 
 
84
63
 
 
4.5
 
 
81
61
 
 
3.5
 
 
74
51
 
 
2.6
 
 
62
40
 
 
2.8
 
 
45
28
 
 
2.1
 
 
32
17
Average max. and min. temperatures in °F
Precipitation totals in inches
Source: The Weather Channel